net: ipa: define BCR values using an enum

The backward compatibility register (BCR) has a set of bit flags
that indicate ways in which the IPA hardware should operate in a
backward compatible way.  The register is not supported starting
with IPA v4.5, and where it is supported, defined bits all have the
same numeric value.

Redefine these flags using an enumerated type, with each member's
value representing the bit position that encodes it in the BCR.
This replaces all of the single-bit field masks previously defined.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/data/ipa_data-v3.1.c

@@ -526,7 +526,7 @@ static const struct ipa_power_data ipa_power_data = {
 /* Configuration data for an SoC having IPA v3.1 */
 const struct ipa_data ipa_data_v3_1 = {
 	.version	= IPA_VERSION_3_1,
-	.backward_compat = BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK,
+	.backward_compat = BIT(BCR_CMDQ_L_LACK_ONE_ENTRY),
 	.qsb_count	= ARRAY_SIZE(ipa_qsb_data),
 	.qsb_data	= ipa_qsb_data,
 	.endpoint_count	= ARRAY_SIZE(ipa_gsi_endpoint_data),

drivers/net/ipa/data/ipa_data-v3.5.1.c

@@ -407,11 +407,11 @@ static const struct ipa_power_data ipa_power_data = {
 /* Configuration data for an SoC having IPA v3.5.1 */
 const struct ipa_data ipa_data_v3_5_1 = {
 	.version	= IPA_VERSION_3_5_1,
-	.backward_compat = BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK |
-			   BCR_TX_NOT_USING_BRESP_FMASK |
-			   BCR_SUSPEND_L2_IRQ_FMASK |
-			   BCR_HOLB_DROP_L2_IRQ_FMASK |
-			   BCR_DUAL_TX_FMASK,
+	.backward_compat = BIT(BCR_CMDQ_L_LACK_ONE_ENTRY) |
+			   BIT(BCR_TX_NOT_USING_BRESP) |
+			   BIT(BCR_SUSPEND_L2_IRQ) |
+			   BIT(BCR_HOLB_DROP_L2_IRQ) |
+			   BIT(BCR_DUAL_TX),
 	.qsb_count	= ARRAY_SIZE(ipa_qsb_data),
 	.qsb_data	= ipa_qsb_data,
 	.endpoint_count	= ARRAY_SIZE(ipa_gsi_endpoint_data),

drivers/net/ipa/ipa_reg.h

@@ -220,20 +220,18 @@ static inline u32 ipa_reg_state_aggr_active_offset(enum ipa_version version)
 
 /* The next register is not present for IPA v4.5+ */
 #define IPA_REG_BCR_OFFSET				0x000001d0
-/* The next two fields are not present for IPA v4.2+ */
-#define BCR_CMDQ_L_LACK_ONE_ENTRY_FMASK		GENMASK(0, 0)
-#define BCR_TX_NOT_USING_BRESP_FMASK		GENMASK(1, 1)
-/* The next field is invalid for IPA v4.0+ */
-#define BCR_TX_SUSPEND_IRQ_ASSERT_ONCE_FMASK	GENMASK(2, 2)
-/* The next two fields are not present for IPA v4.2+ */
-#define BCR_SUSPEND_L2_IRQ_FMASK		GENMASK(3, 3)
-#define BCR_HOLB_DROP_L2_IRQ_FMASK		GENMASK(4, 4)
-/* The next five fields are present for IPA v3.5+ */
-#define BCR_DUAL_TX_FMASK			GENMASK(5, 5)
-#define BCR_ENABLE_FILTER_DATA_CACHE_FMASK	GENMASK(6, 6)
-#define BCR_NOTIF_PRIORITY_OVER_ZLT_FMASK	GENMASK(7, 7)
-#define BCR_FILTER_PREFETCH_EN_FMASK		GENMASK(8, 8)
-#define BCR_ROUTER_PREFETCH_EN_FMASK		GENMASK(9, 9)
+enum ipa_bcr_compat {
+	BCR_CMDQ_L_LACK_ONE_ENTRY		= 0x0,	/* Not IPA v4.2+ */
+	BCR_TX_NOT_USING_BRESP			= 0x1,	/* Not IPA v4.2+ */
+	BCR_TX_SUSPEND_IRQ_ASSERT_ONCE		= 0x2,	/* Not IPA v4.0+ */
+	BCR_SUSPEND_L2_IRQ			= 0x3,	/* Not IPA v4.2+ */
+	BCR_HOLB_DROP_L2_IRQ			= 0x4,	/* Not IPA v4.2+ */
+	BCR_DUAL_TX				= 0x5,	/* IPA v3.5+ */
+	BCR_ENABLE_FILTER_DATA_CACHE		= 0x6,	/* IPA v3.5+ */
+	BCR_NOTIF_PRIORITY_OVER_ZLT		= 0x7,	/* IPA v3.5+ */
+	BCR_FILTER_PREFETCH_EN			= 0x8,	/* IPA v3.5+ */
+	BCR_ROUTER_PREFETCH_EN			= 0x9,	/* IPA v3.5+ */
+};
 
 /* The value of the next register must be a multiple of 8 (bottom 3 bits 0) */
 #define IPA_REG_LOCAL_PKT_PROC_CNTXT_OFFSET		0x000001e8